<?php defined('SYSPATH') or die('No direct script access.');
/**
 * Google Checkout Payment Driver
 *
 * $Id: GoogleCheckout.php 1938 2008-08-03 Domics $
 *
 * @package    Payment
 * @author     Josh Domagala
 * @copyright  (c) 2008 Kohana Team
 * @license    http://kohanaphp.com/license.html
 */
class Payment_Googlecheckout_Driver implements Payment_Driver
{
	// Fields required to do a transaction
	private $required_fields = array
	(
		'action'			=> FALSE,
		'xml_body'			=> FALSE
	);

	private $fields = array
	(
		'google_API_key'				=> '',
		'google_merchant_id'			=> '',
		'google_sandbox_API_key'		=> '',
		'google_sandbox_merchant_id'	=> '',
		'action'						=> '',
		'xml_body'						=> ''
		);

		private $test_mode = TRUE;

		/**
		 * Sets the config for the class.
		 *
		 * @param  array  config passed from the library
		 */
		public function __construct($config)
		{
			$this->fields['google_API_key'] = $config['google_API_key'];
			$this->fields['google_merchant_id'] = $config['google_merchant_id'];
			$this->fields['google_sandbox_API_key'] = $config['google_sandbox_API_key'];
			$this->fields['google_sandbox_merchant_id'] = $config['google_sandbox_merchant_id'];

			$this->curl_config = $config['curl_config'];
			$this->test_mode = $config['test_mode'];

			if($this->test_mode)
			{
				$base64encoding = base64_encode($this->fields['google_sandbox_merchant_id'].":".$this->fields['google_sandbox_API_key']);
			}
			else
			{
				$base64encoding = base64_encode($this->fields['google_merchant_id'].":".$this->fields['google_API_key']);
			}
				
			$this->xml_header = array("Authorization: Basic ".$base64encoding, "Content-Type: application/xml;charset=UTF-8", "Accept: application/xml;charset=UTF-8");

			Kohana::Log('debug', 'Google Checkout Payment Driver Initialized');
		}

		public function set_fields($fields)
		{
			foreach ((array) $fields as $key => $value)
			{
				$this->fields[$key] = $value;
				if (array_key_exists($key, $this->required_fields) and !empty($value)) $this->required_fields[$key] = TRUE;
			}
		}

		/**
		 * Used to process any xml requests
		 *
		 * @return (string) xml string
		 */
		public function process()
		{
			$post_url = ($this->test_mode)
			? 'https://sandbox.google.com/checkout/api/checkout/v2/'.$this->fields['action'].'/Merchant/'.$this->fields['google_sandbox_merchant_id'] // Test mode URL
			: 'https://checkout.google.com/api/checkout/v2/'.$this->fields['action'].'/Merchant/'.$this->fields['google_merchant_id']; // Live URL

			$ch = curl_init($post_url);

			//Set the curl config
			curl_setopt_array($ch, $this->curl_config);
			// Set custom curl options
			curl_setopt($ch, CURLOPT_POST, true);

			// Set the curl POST fields
			curl_setopt($ch, CURLOPT_HTTPHEADER, $this->xml_header);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $this->fields['xml_body']);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

			// Execute post and get results
			$response = curl_exec($ch);
			curl_close ($ch);

			// Return a response if there was one
			return (!empty($response)) ? $response : Kohana::lang('payment.error', Kohana::lang('payment_GoogleCheckout.'.$response['error_code']));
		}
} // End Payment_GoogleCheckout_Driver Class